wifi: ipw2x00: convert to use secs_to_jiffies

Since secs_to_jiffies()(commit:b35108a5) has been introduced, we can
use it to avoid scaling the time to msec.

Signed-off-by: Yuesong Li <liyuesong@vivo.com>
Link: https://patch.msgid.link/20250613102624.3077418-1-liyuesong@vivo.com


Signed-off-by: Johannes Berg <johannes.berg@intel.com>